/* main.c */

#include <stdio.h>
#include <string.h>
#include <ctype.h>

/* lower: converts upper case to lower case */
/* upper: converts lower case to upper case */
int main(int argc, char *argv[])		
{
	int c;
	
	if (strcmp(argv[0], "lower") == 0)
		while ((c = getchar()) != EOF)
			putchar(tolower(c));
	else 
		while ((c = getchar()) != EOF)
			putchar(toupper(c));
	return 0;
}
